18 Maintenance Unit in 1940–1941, RAF Annan was opened as an air station in April 1942 as the base for No.

81 Group 55 OTU pilots flew at low level over the Solway Firth training to fly "Rhubarb" missions, crossing the English Channel to attack targets of opportunity in France and the Low Countries.

3 TEU moved to RAF Aston Down in July 1944,[6] and Annan then served as a sub-site of No.

The main technical area was in the north-eastern sector, and there were at least seven blister hangars around the perimeter.

[13] There was a camp about 600 metres (2,000 ft) north-east of the airfield near the village of Creca which contained various accommodation buildings, huts, and air raid shelters.